Objective To study the factors influencing natural decay rate of artificial microbial aerosol in order to improve the accuracy of examination of air microorganisms.

Synechococcus and Prochlorococcus growth and mortality rates in the northern China Sea: range of variations and correlation with environmental factors;

In this paper,several reasons which make the brooks and small lakes wither away and harmfulness are set forth to remind the whole society paying attention to the problem and getting along with the natural world in perfect harmony,and avoid unnecessary calamities.

Some people say that the literature would wither away.

Marx s theory that commodity relations should be wither away in public ownership system is a scientific foresight.

How does the newspaper deal with the challenge of the Internet? Will newspaper be displaced by Internet and disappear at last? By discussing the advantages of the newspaper and the measures it takes, the author draw the conclusion that newspaper will exist for a long period of time.

The detective story has various characters which disappeared or per- ished in the 1950-1970.

Blindly pursuing computer technology and the Internet, some people lose their scientific and sensible analysis and have the idea that "traditional libraries will disappear in the 21st century".